Unified formalism to study nonstatistical effects in radiative capture reactions

• Published in: Physical review. C, Nuclear physics Nuclear physics, 1991-06, Vol.43 (6), p.2765-2772
• Main Authors: Yuan, ZS, Ho, YK, Liu, JF, Lu, ZH
• Format: Article
• Language: English
• Subjects: 651420 - Nuclear Properties & Reactions, A=20-38, Experimental; 651520 - Nuclear Properties & Reactions, A=39-58, Experimental; 651620 - Nuclear Properties & Reactions, A=59-89, Experimental; 651920 - Nuclear Properties & Reactions, A=190-219, Experimental; ALUMINIUM 27 TARGET; BARYON REACTIONS; CAPTURE; CROSS SECTIONS; E2-TRANSITIONS; ELEMENTS; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; EQUATIONS; FUNCTIONS; HADRON REACTIONS; INTEGRAL EQUATIONS; LEAD 208 TARGET; LIPPMANN-SCHWINGER EQUATION; MANGANESE 55 TARGET; METALS; MEV RANGE; MEV RANGE 01-10; MULTIPOLE TRANSITIONS; NEUTRON REACTIONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTIONS; NUCLEON REACTIONS; TARGETS; TRANSITION ELEMENTS; WAVE FUNCTIONS; YTTRIUM
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.43.2765

Based upon a consistent description of the wave functions of the captured state and the final state, a unified formalism has been established to investigate the nonstatistical effects in radiative nucleon capture reactions at energies ranging from 0.1 to 20 MeV. This model includes the direct-semidirect capture and radiative capture in the compound elastic and inelastic channels. By applying this model theory and including also the statistical contributions of the compound-nucleus process, the radiative neutron capture cross sections in {sup 27}Al, {sup 55}Mn, {sup 89}Y, and {sup 208}Pb have been calculated and the results are compared with the measured data. We have also investigated the relative importance of the operation for each nonstatistical mechanism in the total capture cross sections.